Reactor

Abstract

Provided is a reactor including: a coil including winding portions; and a magnetic core including inner core portions arranged inside of the winding portions and outer core portions arranged outside of the winding portions. The inner core portions are integrated objects with non-divided structures and include core through holes formed in a direction orthogonal to an axial direction of the winding portions, and openings on one side and openings on another side of the core through holes are both closed by the winding portions.

1 . A reactor comprising:
 a coil including winding portions; and   a magnetic core including inner core portions arranged inside of the winding portions and outer core portions arranged outside of the winding portions,   wherein the inner core portions are integrated objects with non-divided structures and include core through holes formed in a direction orthogonal to an axial direction of the winding portions,   openings on one side and openings on another side of the core through holes are both closed by the winding portions,   the core through holes each have an inner peripheral surface shape that is uniform in an axial direction of the core through hole,   a maximum width of each core through hole in a core width direction orthogonal to both the axial direction of the winding portion and the axial direction of the core through hole is 0.1 times or more and 0.7 times or less a width of the inner core portion in the core width direction,   the inner peripheral surface shapes are elongated hole shapes that extend in the core width direction, and   intermediate portions in the core width direction of the inner peripheral surface shapes have constricted shapes.   
     
     
         2 . (canceled) 
     
     
         3 . (canceled) 
     
     
         4 . (canceled) 
     
     
         5 . The reactor according to  claim 1 , further comprising:
 inner resin portions filling spaces between the winding portions and the inner core portions,   wherein the inner resin portions enter the core through holes.   
     
     
         6 . The reactor according to  claim 5 , comprising outer resin portions that cover at least part of the outer core portions and are connected to the inner resin portions. 
     
     
         7 . The reactor according to  claim 1 , wherein the relative permeability of the inner core portions is 5 or more and 50 or less, and
 the relative permeability of the outer core portions is 50 or more and 500 or less, and is greater than the relative permeability of the inner core portions.   
     
     
         8 . The reactor according to  claim 7 , wherein
 the inner core portions are constituted by molded bodies of a composite material including a soft magnetic powder and resin.   
     
     
         9 . The reactor according to  claim 7 , wherein the outer core portions are constituted by compressed powder molded bodies of a soft magnetic powder. 
     
     
         10 . The reactor according to  claim 7 , wherein in a plan view of the magnetic core from above, when a ring-shaped virtual magnetic circuit including central axes of the inner core portions and analogous lines that pass through the centers of gravity of the outer core portions and are connected to the central axes, drawing shapes that are similar to outer boundary lines of the outer core portions, is defined, the percentage that the lengths of the central axes occupy in the length of the virtual magnetic circuit is 50% or less. 
     
     
         11 . The reactor according to  claim 5 , wherein the relative permeability of the inner core portions is 5 or more and 50 or less, and
 the relative permeability of the outer core portions is 50 or more and 500 or less, and is greater than the relative permeability of the inner core portions.   
     
     
         12 . The reactor according to  claim 6 , wherein the relative permeability of the inner core portions is 5 or more and 50 or less, and
 the relative permeability of the outer core portions is 50 or more and 500 or less, and is greater than the relative permeability of the inner core portions.   
     
     
         13 . The reactor according to  claim 8 , wherein in a plan view of the magnetic core from above, when a ring-shaped virtual magnetic circuit including central axes of the inner core portions and analogous lines that pass through the centers of gravity of the outer core portions and are connected to the central axes, drawing shapes that are similar to outer boundary lines of the outer core portions, is defined, the percentage that the lengths of the central axes occupy in the length of the virtual magnetic circuit is 50% or less. 
     
     
         14 . The reactor according to  claim 9 , wherein in a plan view of the magnetic core from above, when a ring-shaped virtual magnetic circuit including central axes of the inner core portions and analogous lines that pass through the centers of gravity of the outer core portions and are connected to the central axes, drawing shapes that are similar to outer boundary lines of the outer core portions, is defined, the percentage that the lengths of the central axes occupy in the length of the virtual magnetic circuit is 50% or less.